Analysis of Tap Water for Metallic Cations

  • Thread starter Thread starter adenine135
  • Start date Start date
  • Tags Tags
    Analysis Water
AI Thread Summary
The discussion focuses on analyzing tap water containing an unknown cation that forms a complex with EDTA at pH 10 but not at pH 12, with a formation constant of 1×10^13. The presence of this cation does not interfere with EBT or Calcon indicators. It is suggested that the unknown cation could affect the measured concentrations of Ca2+ and Mg2+ ions by potentially binding to EDTA, leading to inaccurate results. The discussion emphasizes the importance of understanding the pH conditions and the specific interactions of the cation with EDTA. Overall, the presence of the unknown cation impurity could skew the analysis of metallic cations in the water sample.
adenine135
Messages
7
Reaction score
0
Assume that the tap water to be analyzed contains a certain amount of an unknown cation which forms a complex with EDTA at pH 10 but not at pH 12. The formation constant for the EDTA complex of this unknown cation at pH 10 is 1×10^13. Neither the EBT nor Calcon indicators are affected by the presence of this cation. How would the values of the concentration of Ca2+ ions and the concentration of Mg2+ ions determined in this experiment be affected by the presence of this unknown cation impurity?



I have absolutely no idea where to even start with this one :(
 
Physics news on Phys.org
What experiment? What pH? Details!
 
Thread 'Confusion regarding a chemical kinetics problem'

Thread 'Confusion regarding a chemical kinetics problem'

TL;DR Summary: cannot find out error in solution proposed. [![question with rate laws][1]][1] Now the rate law for the reaction (i.e reaction rate) can be written as: $$ R= k[N_2O_5] $$ my main question is, WHAT is this reaction equal to? what I mean here is, whether $$k[N_2O_5]= -d[N_2O_5]/dt$$ or is it $$k[N_2O_5]= -1/2 \frac{d}{dt} [N_2O_5] $$ ? The latter seems to be more apt, as the reaction rate must be -1/2 (disappearance rate of N2O5), which adheres to the stoichiometry of the...
View full post »

Similar threads

Chemistry How Does Mg2+ Complex Formation Influence Ca2+ Concentration?
Replies
3
Views
2K
Water Hardness. Calculating Calcium.
Replies
1
Views
3K
Precipitation of lead hydroxide in the presence of EDTA
Replies
5
Views
2K
Calculating pH of Mixture of 0.1 M Na2S and 0.05 M HCl
Replies
1
Views
6K
How pH would affect the dative bonding
Replies
5
Views
3K
EDTA titration-(Analytical Chem.)
Replies
6
Views
14K
Bio Homework Review (Please check and Correct)
Replies
11
Views
20K
Is my fictional Solar System stable and realistic?
Replies
21
Views
4K
Recent research relevant to quasar evolution
Replies
6
Views
4K
Planck instant and neurobiology. Could mind exist outside time-courses?
Replies
5
Views
3K

Hot Threads

Recent Insights

Back
Top